Moral and theoretical deficiencies of the main foundation strategies in social and political systems (Social Engineering, Foundationalism and Invisible Hand theories) are explained by the necessity of a synthesis of different kinds of rationality, i.e., goal-rationality, norm-rationality and rightness and weighing rationality. The anthropological basis of the theory is a distinction between homo finalis and homo socialis. At the institutional level, this conception leads to a synthesis of the rule of law and the welfare state. At the political level, this (...) implies a retonsideration of the principles of democracy and political planning. (shrink)